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Because they are represented as fractions.
Yes. Rational functions must contain rational expressions in order to be rational.
Such functions are defined as one polynomial divided by another polynomial. Their properties include that they are defined at all points, except when the denominator is zero. Also, such functions are continuous at all points where they are defined; and all their derivatives exist at any point where they are defined.For more details, I suggest you read the Wikipedia article - or some other source - on "Rational function".
Sometimes :)
A rational function is the quotient of two polynomial functions.